Low Voltage Current Transformer

Abstract

The invention discloses a low-voltage current transformer, belonging to the technical field of current transformers, and comprises a transformer body, wherein the transformer body comprises a lower shell and an upper shell inserted in the lower shell, wherein two groups of open iron cores are assembled in the lower shell and the upper shell, wherein enameled wires are wound on the open iron cores through a protective shell, and a wiring unit is assembled on the top of the upper shell; through a centering mechanism, a busbar, a horizontal or vertical busbar can be centered and fixed in the center of a window hole to ensure measurement accuracy; when in use, the clamp is adjusted according to the type of the busbar or busbar: the busbar uses a surface and side arc clamp; the horizontal busbar uses a complete side clamp and a surface clamp; the vertical busbar is clamped after the clamp position is replaced by an adjustment disk, and this flexible state switching makes the transformer suitable for busbars and busbars of various sizes and directions, so that the busbars can be quickly fixed in the center of the window hole and the measurement accuracy can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformers, and in particular to a low-voltage current transformer. Background Art

[0002] A low voltage current transformer is a current detection and measurement device used in power systems. Its function is to convert large currents into relatively small currents for power supply detection and measurement.

[0003] The hole in the middle of a low-voltage current transformer is usually called a window hole. The middle window hole is used for the primary busbar to pass through. When the current transformer is in use, the busbar or busbar passing through the middle window hole needs to be placed in the center to ensure that the current transformer can measure the current more accurately.

[0004] In particular, the open-type low-voltage current transformer in the prior art can be easily disassembled and assembled without disconnecting the circuit. However, although such low-voltage current transformers on the current market provide convenience in installation and disassembly, they are insufficient in ensuring that the busbar or busbar is centered. They usually rely on fixing devices on the shell, such as bolts, to fix the busbar or busbar in the center of the window hole. However, this method makes it difficult to accurately fix the busbar or busbar in the center of the window hole. Once the busbar or busbar deviates from the center, it will cause uneven distribution of the electromagnetic field, which will have an adverse effect on the measurement accuracy. Summary of the invention

[0005] The purpose of the present invention is to propose a low-voltage current transformer in order to solve the problem that it is difficult to accurately fix the busbar or busbar at the center of the window hole. Once the busbar or busbar deviates from the center, it will cause uneven distribution of the electromagnetic field, which will in turn have an adverse effect on the measurement accuracy.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A low-voltage current transformer comprises a transformer body, wherein the transformer body comprises a lower shell and an upper shell inserted in the lower shell, wherein two groups of open cores are installed in the lower shell and the upper shell, wherein enameled wires are wound around the open cores through a protective shell, wherein a wiring unit is installed on the top of the upper shell, and a centering mechanism for driving a busbar or a cable to be fixed at a central position is installed on the front and back sides of the lower shell and the upper shell;

[0008] The centering mechanism includes an adjustment disk and a transverse positive and negative threaded rod and a vertical positive and negative threaded rod mounted on the adjustment disk, the transverse positive and negative threaded rod is equipped with a side clamping piece, and the vertical positive and negative threaded rod is equipped with a surface clamping piece;

[0009] One end of the transverse positive and negative threaded rod and the vertical positive and negative threaded rod are meshed and connected via bevel gears, so that the rotation directions of the transverse positive and negative threaded rod and the vertical positive and negative threaded rod are opposite, and the thread direction of the surface of the vertical positive and negative threaded rod is opposite to the thread direction of the surface of the transverse positive and negative threaded rod;

[0010] The clockwise rotation of the transverse positive and negative screw drives the side clamping parts to approach each other, and at the same time, the vertical positive and negative screw is driven by the bevel gear to rotate counterclockwise, and under the action of the thread direction opposite to the transverse positive and negative screw, the surface clamping parts are also brought close to each other, thereby driving the busbar or busbar to be fixed at the center position of the window hole.

[0011] As a further description of the above technical solution:

[0012] The side clamping member comprises two transverse internal threaded members threadedly sleeved on transverse positive and negative threaded rods, the bottoms of the two transverse internal threaded members are fixed with transverse extension members, a vertical connecting rod is slidably mounted in the transverse extension member, a second spring is fixed on one side wall of the transverse extension member through a third shock-absorbing pad, and one end of the second spring is fixed to one end of the vertical connecting rod sliding in the transverse extension member through a fourth shock-absorbing pad;

[0013] The other end of the vertical connecting rod is fixed with a transverse telescopic rod by a first bolt, one end of the transverse telescopic rod is fixed with a side arc clamp, the top and bottom ends of the side arc clamp are slidably equipped with side straight clamps, and the inner sides of the side arc clamp and the side straight clamp are fixed with side insulating pads.

[0014] As a further description of the above technical solution:

[0015] The surface clamping member comprises two vertical internal threaded members threadedly sleeved on the vertical positive and negative threaded rods, the front faces of the two vertical internal threaded members are fixed with vertical extension members, a horizontal connecting rod is slidably mounted in the vertical extension member, a third spring is fixed on the inner top wall of the vertical extension member via a fifth shock-absorbing pad, and one end of the third spring is fixed to one end of the horizontal connecting rod sliding in the vertical extension member via a sixth shock-absorbing pad;

[0016] The other end of the horizontal connecting rod is fixed with a vertical telescopic rod through a first bolt, one end of the vertical telescopic rod is fixed with a surface arc clamp, the top and bottom ends of the surface arc clamp are slidably equipped with surface straight clamps, and the inner sides of the surface arc clamp and the surface straight clamp are fixed with surface insulation pads;

[0017] The backs of the transverse internal threaded member and the vertical internal threaded member are both fixed with guide slide blocks, the top and one side of the outer wall of the adjustment plate are both provided with guide slide grooves, and the transverse internal threaded member and the vertical internal threaded member are respectively slidably connected in the two guide slide grooves through the guide slide blocks;

[0018] A guide rod is fixed to the middle of the outer wall of the side arc-shaped clamp and the surface arc-shaped clamp. Two guide pieces are slidably sleeved on the guide rod. One end of the guide is fixed to the adjustment disk.

[0019] As a further description of the above technical solution:

[0020] The outer surface of the horizontal positive and negative threaded rod is sleeved with two first bearing seats, one end of which is fixed to the adjustment disk, and the vertical positive and negative threaded rod is sleeved with two second bearing seats, one end of which is fixed to the adjustment disk;

[0021] A brake part is sleeved on one side of the outer surface of the transverse positive and negative screw rod close to one of the first bearing seats, one end of the brake part is fixed to the adjusting disk, and a knob stud is threaded through the brake part. One end of the knob stud penetrates into the brake part and abuts against the outer wall of the transverse positive and negative screw rod, so that the transverse positive and negative screw rod can be fixed in the brake part after rotation.

[0022] As a further description of the above technical solution:

[0023] The transformer body further comprises two lower shell covers and two upper shell covers, and the two lower shell covers and the two upper shell covers are detachably fixed to the front and back sides of the lower shell and the upper shell respectively;

[0024] An annular slot is formed on the outer walls of the lower shell cover and the upper shell cover. A rotating ring matched with the annular slot is fixed on the back of the adjustment disk. The adjustment disk is rotatably connected to the annular slot via the rotating ring.

[0025] As a further description of the above technical solution:

[0026] Positioning screw holes are provided at the edges of the outer walls of the lower shell cover and the upper shell cover, and positioning bolts matching the positioning screw holes are threaded through the top and bottom of the outer wall of the adjustment disk, so that the adjustment disk can be fixed on the surface of the lower shell cover and the upper shell cover after rotation.

[0027] As a further description of the above technical solution:

[0028] The open iron core comprises a lower iron core, the front and back sides of the lower shell are both provided with lower mounting grooves adapted to the lower iron core, the lower iron core is assembled in the lower mounting grooves, the front and back sides of the upper shell are both provided with upper mounting grooves, the upper iron core is assembled in the upper mounting grooves;

[0029] The two ends of the lower iron core and the upper iron core are connected after the lower shell and the upper shell are fixed, and the enameled wire is wound around the surface of the protective shell on the upper iron core.

[0030] As a further description of the above technical solution:

[0031] A strip-shaped slide groove is provided on the upper surface of the upper shell;

[0032] The wiring unit includes a wiring piece slidably assembled in a strip-shaped slide groove, two lower contact pieces are provided on both sides of the bottom wall of the strip-shaped slide groove, and the four lower contact pieces are evenly divided into two groups. The ends of the enameled wires on the two groups of open iron cores are respectively connected to the two groups of lower contact pieces, a wiring groove is provided on one side of the wiring piece, a fixed piece groove is provided on the bottom wall of the wiring groove, and an upper contact piece adapted to the lower contact piece is fixed in the fixed piece groove.

[0033] As a further description of the above technical solution:

[0034] A valve piece is clamped at the edge of the wiring slot, and adjusting bolts are threadedly penetrated on both sides of the upper surface of the wiring piece, and one end of the adjusting bolt that penetrates into the wiring slot is rotatably connected to a clamping piece;

[0035] An extension piece is fixed to the bottom of the back side of the terminal block, and a fixing stud is threaded through the extension piece. Two fixing screw holes matching the fixing stud are provided on both sides of the upper surface of the upper shell, so that the terminal block can be fixed on the surface of the upper shell after being moved.

[0036] As a further description of the above technical solution:

[0037] Two guard plates for protecting the unused lower contact pieces are slidably installed in the strip slide groove, and long grooves are provided on both sides of the middle part of the bottom wall of the strip slide groove, and a first spring is fixed to one side wall of the long groove through a first shock-absorbing pad, and a slide plate adapted to the long groove is fixed to the lower surface of the guard plate, and one end of the first spring is fixed to the slide plate through a second shock-absorbing pad.

[0038] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0039] 1. Through the centering mechanism, the busbar, the horizontally placed busbar, and the vertically placed busbar can be fixed in the center of the window hole to ensure the measurement accuracy;

[0040] When used for busbars, the straight face clamp and the side straight side clamp are removed, leaving only the curved face clamp and the side curved side clamp, and then the horizontal positive and negative threaded rods are rotated clockwise and the vertical positive and negative threaded rods are driven to rotate synchronously, so that the two curved face clamps and the side curved side clamps gradually move closer to the center of the window hole, and then the busbar is clamped and fixed at the center of the window hole, ensuring the accuracy of the busbar measurement;

[0041] When used for a horizontally placed busbar, the horizontal positive and negative screws are rotated clockwise and the vertical positive and negative screws are driven to rotate synchronously, so that the two side clamps are brought closer to each other, and the two surface clamps are also brought closer to each other, and then the horizontally placed busbar is fixed at the center of the window hole, ensuring the accuracy of measuring the horizontally placed busbar;

[0042] When used for a vertically placed busbar, the side clamping parts and the surface clamping parts are replaced by rotating the adjustment disk clockwise or counterclockwise to adapt to the vertically placed busbar. At this time, the above actions are repeated to make the two side clamping parts and the surface clamping parts close to each other, so that the vertically placed busbar is fixed at the center of the window hole, thereby ensuring the accuracy of measuring the vertically placed busbar;

[0043] With the coordinated use of several devices, through state switching, the mutual inductor can be applied to busbars and busbars of different sizes, as well as busbars placed in different directions, so that the busbar or busbar can be quickly fixed at the center of the window hole to ensure measurement accuracy.

[0044] 2. By setting up the wiring unit, when a set of open iron cores and the enameled wires thereon have problems, the wiring piece is slid to the other side so that the upper contact piece contacts the other set of lower contact pieces, thereby enabling the faulty set to be repaired and replaced while ensuring normal use. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of the structure of a first viewing angle provided by an embodiment of the present invention is shown;

[0046] Figure 2 A schematic diagram showing the structural installation of the surface of the adjustment disk provided in an embodiment of the present invention is shown;

[0047] Figure 3 The embodiment of the present invention provides Figure 2 The enlarged structural diagram at A in the middle;

[0048] Figure 4 The embodiment of the present invention provides Figure 2 The enlarged structural diagram at B in the middle;

[0049] Figure 5 A schematic diagram of the structure of a second viewing angle provided according to an embodiment of the present invention is shown;

[0050] Figure 6 A schematic diagram of structural decomposition according to an embodiment of the present invention is shown;

[0051] Figure 7 A schematic structural diagram of a wiring member provided in an embodiment of the present invention is shown;

[0052] Figure 8 A schematic diagram showing the structural disassembly of a side clamping member provided according to an embodiment of the present invention is shown;

[0053] Fig. 9 A schematic diagram showing the structural disassembly of a surface clamping member provided according to an embodiment of the present invention is shown;

[0054] Fig.10 It shows a schematic structural diagram of a centering mechanism clamping a busbar according to an embodiment of the present invention;

[0055] Fig.11 It shows a schematic structural diagram of a connection member after switching positions according to an embodiment of the present invention;

[0056] Fig.12 A schematic structural diagram of a centering mechanism provided according to an embodiment of the present invention clamping a transversely placed busbar is shown;

[0057] Fig.13 A schematic structural diagram of a centering mechanism provided according to an embodiment of the present invention clamping a vertically placed busbar is shown.

[0058] Legend:

[0059] 10. Transformer body; 11. Lower shell; 12. Upper shell; 13. Open core; 131. Lower core; 132. Upper core; 14. Protective shell; 15. Enameled wire; 16. Lower shell cover; 17. Upper shell cover;

[0060] 20. Wiring unit; 21. Wiring piece; 22. Lower contact piece; 23. Upper contact piece; 24. Guard plate;

[0061] 30. Centering mechanism; 31. Adjustment plate; 32. Horizontal positive and negative threaded rod; 33. Vertical positive and negative threaded rod; 34. Side clamping piece; 341. Horizontal internal threaded piece; 342. Horizontal extension piece; 343. Vertical connecting rod; 344. Second spring; 345. Side arc clamp; 346. Side straight clamp; 347. Side insulating pad; 348. Horizontal telescopic rod; 35. Surface clamping piece; 351. Vertical internal threaded piece; 352. Vertical extension piece; 353. Horizontal connecting rod; 354. Third spring; 355. Surface arc clamp; 356. Surface straight clamp; 357. Surface insulating pad; 358. Vertical telescopic rod; 36. Bevel gear; 37. Brake piece; 38. Knob stud; 39. Positioning bolt;

[0062] 40. Guide rod;

[0063] 50. Guide member. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] Embodiment 1

[0066] like Figure 1 - Fig.13 As shown, the present invention provides:

[0067] A low-voltage current transformer includes a transformer body 10, which includes a lower shell 11 and an upper shell 12 inserted into the lower shell 11. Specifically, screws are provided at the bottom of the outer wall of the upper shell 12. After the lower shell 11 is connected to the upper shell 12, the lower shell 11 and the upper shell 12 can be fixed together by tightening the screws. When the lower shell 11 is on top, two groups of open iron cores 13 are jointly assembled in the lower shell 11 and the upper shell 12. The open iron core 13 is wound with enameled wire 15 through a protective shell 14. A wiring unit 20 is assembled on the top of the upper shell 12. The front and back sides of the lower shell 11 and the upper shell 12 are equipped with a centering mechanism 30 for driving a busbar or cable to be fixed at a center position.

[0068] like Figure 6 As shown, the open core 13 includes a lower core 131, and lower mounting grooves adapted to the lower core 131 are provided on the front and back of the lower shell 11, and the lower core 131 is assembled in the lower mounting groove, and upper mounting grooves are provided on the front and back of the upper shell 12, and an upper core 132 is assembled in the upper mounting groove. The two ends of the lower core 131 and the upper core 132 are connected after the lower shell 11 and the upper shell 12 are fixed, and the enameled wire 15 is wound around the surface of the protective shell 14 on the upper core 132. Preferably, in actual use, the lower core 131 is only loaded in one lower mounting groove. When a complete set of open cores 13 has problems during use, the lower core 131 is loaded to make the other set complete, so that the transformer can be kept in normal use during maintenance;

[0069] The transformer body 10 also includes two lower shell covers 16 and two upper shell covers 17, which are respectively detachably fixed to the front and back of the lower shell 11 and the upper shell 12, and are used to close the lower mounting groove and the upper mounting groove, and the lower shell cover 16 and the upper shell cover 17 are connected and fixed to the lower shell 11 and the upper shell 12 by countersunk screws. During maintenance, the corresponding lower shell cover 16 and the upper shell cover 17 can be opened after selecting the countersunk screws, and the enameled wire 15 will be exposed at this time. At the same time, the open iron core 13 together with the protective shell 14 and the enameled wire 15 can be taken out from the lower shell 11 and the upper shell 12, which is more convenient for maintenance.

[0070] like Figure 1 , Figure 6 and Figure 7 As shown, a strip-shaped slide groove is provided on the upper surface of the upper shell 12, and the wiring unit 20 includes a wiring piece 21 slidably assembled in the strip-shaped slide groove, two lower contact pieces 22 are provided on both sides of the bottom wall of the strip-shaped slide groove, and the four lower contact pieces 22 are evenly divided into two groups, and the ends of the enameled wires 15 on the two groups of open iron cores 13 are respectively connected to the two groups of lower contact pieces 22, and a wiring groove is provided on one side of the wiring piece 21, and a fixed piece groove is provided on the bottom wall of the wiring groove, and an upper contact piece 23 adapted to the lower contact piece 22 is fixed in the fixed piece groove, and the upper contact piece 23 is "U"-shaped as a whole;

[0071] In actual use, the connection piece 21 can slide left and right to make the upper contact piece 23 contact with any group of lower contact pieces 22, and can be switched during use;

[0072] Two guard plates 24 for protecting the unused lower contact piece 22 are slidably mounted in the strip slide. Long grooves are provided on both sides of the middle of the bottom wall of the strip slide. A first spring is fixed to one side wall of the long groove through a first shock-absorbing pad. A slide plate adapted to the long groove is fixed to the lower surface of the guard plate 24. One end of the first spring is fixed to the slide plate through a second shock-absorbing pad. When the terminal 21 slides, one of the two guard plates 24 will be pushed to one side and slide, so that the first spring connected to the slide plate on the lower surface is compressed, and the other will slide with the terminal 21 under the drive of the first spring to keep the shielding protection of the lower contact piece 22.

[0073] A valve piece is clamped at the edge of the wiring slot, and both sides of the upper surface of the terminal piece 21 are threaded with adjusting bolts, and one end of the adjusting bolt inserted into the wiring slot is rotatably connected to a clamping piece. When the connecting wire of the measuring instrument or relay protection device is placed in the wiring slot, the clamping piece is moved downward by rotating the adjusting bolt, and then the end of the connecting wire is pressed against and fixed on the surface of the lower contact piece 22. An extension piece is fixed to the bottom of the back of the terminal piece 21, and a fixing stud is threaded on the extension piece. Two fixing screw holes matching the fixing studs are provided on both sides of the upper surface of the upper shell 12, so that the terminal piece 21 can be fixed on the surface of the upper shell 12 after moving;

[0074] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the centering mechanism 30 includes an adjusting disk 31 and a transverse positive and negative threaded rod 32 and a vertical positive and negative threaded rod 33 mounted on the adjusting disk 31. The outer surface of the transverse positive and negative threaded rod 32 is sleeved with two first bearing seats, one end of the first bearing seat is fixed to the adjusting disk 31, and the transverse positive and negative threaded rod 32 is equipped with a side clamp 34. The vertical positive and negative threaded rod 33 is sleeved with two second bearing seats, one end of the second bearing seat is fixed to the adjusting disk 31, and the vertical positive and negative threaded rod 33 is equipped with a surface clamp 35.

[0075] One end of the transverse positive and negative threaded rod 32 and the vertical positive and negative threaded rod 33 are meshed and connected through a bevel gear 36, so that the rotation directions of the transverse positive and negative threaded rod 32 and the vertical positive and negative threaded rod 33 are opposite, and the thread direction of the surface of the vertical positive and negative threaded rod 33 is opposite to the thread direction of the surface of the transverse positive and negative threaded rod 32;

[0076] The clockwise rotation of the transverse positive and negative screw rod 32 drives the side clamping parts 34 to approach each other, and at the same time, the vertical positive and negative screw rod 33 is driven by the bevel gear 36 to rotate counterclockwise, and under the action of the thread direction opposite to the transverse positive and negative screw rod 32, the surface clamping parts 35 are also approached to each other, thereby driving the busbar or busbar to be fixed at the center position of the window hole.

[0077] like Figure 2 , Figure 8 and Fig. 9As shown, the side clamping member 34 includes two transverse internal threaded members 341 threadedly sleeved on the transverse positive and negative threaded rods 32, the bottoms of the two transverse internal threaded members 341 are fixed with transverse extension members 342, a vertical connecting rod 343 is slidably mounted in the transverse extension member 342, a second spring 344 is fixed to one side wall of the transverse extension member 342 through a third shock-absorbing pad, one end of the second spring 344 is fixed to one end of the vertical connecting rod 343 sliding in the transverse extension member 342 through a fourth shock-absorbing pad, the other end of the vertical connecting rod 343 is fixed with a transverse telescopic rod 348 through a first bolt, one end of the transverse telescopic rod 348 is fixed with a side arc clamp 345, the inner sides of the side arc clamp 345 and the side straight clamp 346 are fixed with side insulating pads 347, preferably, the two transverse extension members 342 are staggered with each other;

[0078] The surface clamping member 35 comprises two vertical internal threaded members 351 which are threadedly sleeved on the vertical positive and negative threaded rods 33, the front faces of the two vertical internal threaded members 351 are fixed with vertical extension members 352, a horizontal connecting rod 353 is slidably mounted in the vertical extension member 352, a third spring 354 is fixed to the inner top wall of the vertical extension member 352 through a fifth shock-absorbing pad, one end of the third spring 354 is fixed to one end of the horizontal connecting rod 353 which slides in the vertical extension member 352 through a sixth shock-absorbing pad, a vertical telescopic rod 358 is fixed to the other end of the horizontal connecting rod 353 through a first bolt, a surface arc clamp 355 is fixed to one end of the vertical telescopic rod 358, and surface insulating pads 357 are fixed to the inner sides of the surface arc clamp 355 and the surface straight clamp 356, preferably, the two vertical extension members 352 are staggered with each other;

[0079] In the initial state, the side arc clamp 345 and the surface arc clamp 355 are at the same distance from the center of the window hole. When the transformer body 10 is installed outside the busbar and fixed in position, the horizontal positive and negative threaded rod 32 is rotated clockwise, and the vertical positive and negative threaded rod 33 is driven to rotate counterclockwise under the cooperation of the two bevel gears 36. The clockwise rotating horizontal positive and negative threaded rod 32 drives the two horizontal internal threaded members 341 to approach each other, thereby making the two side arc clamps 345 approach each other toward the center of the window hole.

[0080] Since the vertical positive and negative screw rod 33 and the horizontal positive and negative screw rod 32 have opposite thread directions, the counterclockwise rotation of the vertical positive and negative screw rod 33 will also drive the two arc clamps 355 to approach each other toward the center of the window hole, and then gradually hit the outer wall of the busbar and clamp the busbar to the center of the window hole.

[0081] Guide sliders are fixed to the back sides of the transverse internal threaded component 341 and the vertical internal threaded component 351, and guide grooves are opened on the top and one side of the outer wall of the adjustment disk 31. The transverse internal threaded component 341 and the vertical internal threaded component 351 are respectively slidably connected in the two guide grooves through guide sliders. The guide sliders can prevent the transverse internal threaded component 341 and the vertical internal threaded component 351 from rotating when the two forward and reverse screw rods rotate, and can move along the guide grooves.

[0082] A guide rod 40 is fixed to the middle of the outer wall of the side arc clamp 345 and the surface arc clamp 355. Two guide members 50 are slidably sleeved on the guide rod 40. One end of the guide member 50 is fixed to the adjustment disk 31. During the movement, the guide rod 40 can ensure that the side arc clamp 345 and the surface arc clamp 355 maintain their own state and will not tilt.

[0083] A brake component 37 is sleeved on one side of the outer surface of the transverse positive and negative threaded rod 32 close to one of the first bearing seats, and one end of the brake component 37 is fixed to the adjusting disk 31. A knob stud 38 is threaded through the brake component 37. One end of the knob stud 38 penetrates into the brake component 37 and abuts against the outer wall of the transverse positive and negative threaded rod 32, so that the transverse positive and negative threaded rod 32 can be fixed in the brake component 37 after being rotated.

[0084] After stopping the rotation of the transverse positive and negative screw rod 32, rotate the knob stud 38 so that its end abuts against the outer wall of the transverse positive and negative screw rod 32, thereby fixing the position of the transverse positive and negative screw rod 32, thereby fixing the vertical positive and negative screw rod 33 as well, and preventing the positive and negative screw rod from rotating during the process of centering the busbar.

[0085] Embodiment 2

[0086] like Figure 8 , Fig. 9 and Fig.12 As shown, the top and bottom ends of the side arc-shaped clamp 345 are slidably assembled with the side straight clamp 346, and the top and bottom ends of the surface arc-shaped clamp 355 are slidably assembled with the surface straight clamp 356;

[0087] After the side straight clamp 346 is mounted on the side arc-shaped clamp 345, and the surface straight clamp 356 is mounted on the surface arc-shaped clamp 355, the mutual inductor can be used for the transversely placed busbar. When in use, the mutual inductor body 10 is mounted outside the transversely placed busbar and fixed in position;

[0088] Specifically, firstly, the distance between the face straight clamp 356 and the center of the window hole can be changed by adjusting the length of the vertical telescopic rod 358 according to the length-width ratio of the busbar, so that the distance between the face straight clamp 356 and the window hole and the distance between the side straight clamp 346 and the window hole are adapted to the length-width ratio of the busbar, so that the face straight clamp 356 and the side straight clamp 346 can fix the horizontally placed busbar at the center of the window hole after moving the same distance;

[0089] Secondly, the distance between the face straight clamp 356 and the window hole may not be changed. In this state, the distance between the lower straight clamp 356 and the busbar surface is greater than the distance between the side straight clamp 346 and the side surface of the busbar placed laterally. When the side straight clamp 346 moves to abut against the side surface of the busbar, the face straight clamp 356 is still at a distance from the surface of the busbar placed laterally. At this time, the horizontal positive and negative threaded rod 32 needs to be rotated further. Since the horizontal internal threaded member 341 is connected to the vertical connecting rod 343 by sliding through the horizontal extension member 342, and the horizontal extension member 342 and the vertical connecting rod 343 are connected by a second spring 344;

[0090] Therefore, in the initial movement, the horizontal internal threaded member 341 can drive the side straight clamp 346 to move together. When the side straight clamp 346 hits the side surface of the horizontally placed busbar, the horizontal positive and negative threaded rod 32 continues to rotate, and the horizontal internal threaded member 341 continues to move on the vertical connecting rod 343. During the movement, the second spring 344 is compressed. At this time, the vertical positive and negative threaded rod 33 continues to rotate together, so that the vertical internal threaded member 351 drives the surface straight clamp 356 to gradually hit the surface of the horizontally placed busbar.

[0091] Therefore, when the transverse positive and negative screw rod 32 rotates clockwise, the vertical positive and negative screw rod 33 is driven to rotate counterclockwise with the cooperation of the two bevel gears 36. The clockwise rotating transverse positive and negative screw rod 32 will drive the two transverse internal threaded parts 341 to approach each other, and then make the two side arc clamps 345 approach each other toward the center of the window hole. At the same time, the vertical positive and negative screw rod 33 will also drive the two surface arc clamps 355 to approach each other toward the center of the window hole, and then gradually press against the side and surface of the transversely placed busbar, and clamp the transversely placed busbar to the center of the window hole. Finally, the transverse positive and negative screw rod 32 is fixed after fixing.

[0092] Embodiment 3

[0093] like Figure 6 , Figure 8 , Fig. 9 and Fig.13 As shown, an annular groove is provided on the outer wall of the lower shell cover 16 and the upper shell cover 17, and a rotating ring adapted to the annular groove is fixed on the back of the adjustment plate 31, and the adjustment plate 31 is rotatably connected to the annular groove through the rotating ring;

[0094] The edges of the outer walls of the lower shell cover 16 and the upper shell cover 17 are provided with positioning screw holes, and the top and bottom of the outer wall of the adjustment plate 31 are threaded with positioning bolts 39 that match the positioning screw holes, so that the adjustment plate 31 can be fixed on the surface of the lower shell cover 16 and the upper shell cover 17 after rotation.

[0095] After driving the adjustment disk 31 to rotate 90°, the mutual inductor can be used for the vertically placed busbar. When in use, the mutual inductor body 10 is installed outside the vertically placed busbar and fixed in position, and the position of the straight clamp 356 is adjusted or kept as it is;

[0096] Then rotate the horizontal positive and negative screw rod 32 clockwise, and drive the vertical positive and negative screw rod 33 to rotate counterclockwise with the cooperation of the two bevel gears 36. The clockwise rotating horizontal positive and negative screw rod 32 will drive the two horizontal internal threaded parts 341 to approach each other, and then make the two side arc clamps 345 approach each other toward the center of the window hole. At the same time, the vertical positive and negative screw rod 33 will also drive the two surface arc clamps 355 to approach each other toward the center of the window hole, and then gradually press against the side and surface of the vertically placed busbar, and clamp the vertically placed busbar to the center of the window hole. Finally, fix the horizontal positive and negative screw rod 32.

[0097] Specifically, when the low voltage current transformer is working / in use:

[0098] First, adjust according to the busbar or busbar to be used. When applied to a busbar, remove the surface straight clamp 356 and the side straight clamp 346, and only keep the surface arc clamp 355 and the side arc clamp 345. When applied to a horizontally placed busbar, keep the surface straight clamp 356 and the side straight clamp 346 installed. When applied to a vertically placed busbar, keep the straight clamp installed and rotate the adjustment disk 31 clockwise or counterclockwise to replace the side clamp 34 with the surface clamp 35.

[0099] Then, the horizontal positive and negative threaded rod 32 is rotated clockwise and the vertical positive and negative threaded rod 33 is driven to rotate synchronously, so that the side clamping member 34 and the surface clamping member 35 gradually move closer to the center of the window hole, and then the busbar, the horizontally placed busbar or the vertically placed busbar is clamped and fixed at the center of the window hole, so as to ensure the accuracy of the measurement of the busbar, the horizontally placed busbar or the vertically placed busbar;

[0100] During use, when a set of open iron cores 13 and the enameled wires 15 thereon have problems, the terminal piece 21 is slid to the other side so that the upper contact piece 23 contacts the other set of lower contact pieces 22, thereby enabling the faulty set to be repaired and replaced while ensuring normal use.

[0101] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low-voltage current transformer, comprising a transformer body (10), the transformer body (10) comprising a lower shell (11) and an upper shell (12) inserted into the lower shell (11), two groups of open iron cores (13) being assembled in the lower shell (11) and the upper shell (12), the open iron cores (13) being wound with enameled wires (15) through a protective shell (14), characterized in that: The top of the upper housing (12) is equipped with a wiring unit (20), and the front and back sides of the lower housing (11) and the upper housing (12) are equipped with centering mechanisms (30) for driving the busbar or the cable to be fixed at a central position; The centering mechanism (30) comprises an adjustment disk (31) and a transverse positive and negative threaded rod (32) and a vertical positive and negative threaded rod (33) mounted on the adjustment disk (31); the transverse positive and negative threaded rod (32) is mounted with a side clamp (34), and the vertical positive and negative threaded rod (33) is mounted with a surface clamp (35); One end of the transverse positive and negative threaded rod (32) and the vertical positive and negative threaded rod (33) are meshedly connected via a bevel gear (36), so that the rotation directions of the transverse positive and negative threaded rod (32) and the vertical positive and negative threaded rod (33) are opposite, and the thread direction of the surface of the vertical positive and negative threaded rod (33) is opposite to the thread direction of the surface of the transverse positive and negative threaded rod (32); The clockwise rotation of the transverse positive and negative threaded rod (32) drives the side clamping members (34) to approach each other, and at the same time, the vertical positive and negative threaded rod (33) is driven by the bevel gear (36) to rotate counterclockwise, and under the action of the thread direction opposite to the transverse positive and negative threaded rod (32), the surface clamping members (35) are also brought closer to each other, thereby driving the busbar or busbar to be fixed at the center position of the window hole; The side clamping member (34) comprises two transverse internal threaded members (341) threadedly sleeved on the transverse positive and negative threaded rods (32), the bottoms of the two transverse internal threaded members (341) are both fixed with transverse extension members (342), a vertical connecting rod (343) is slidably mounted in the transverse extension member (342), a second spring (344) is fixed on a side wall of the transverse extension member (342) via a third shock-absorbing pad, and one end of the second spring (344) is fixed to one end of the vertical connecting rod (343) sliding in the transverse extension member (342) via a fourth shock-absorbing pad; The other end of the vertical connecting rod (343) is fixed with a transverse telescopic rod (348) via a first bolt, one end of the transverse telescopic rod (348) is fixed with a side arc-shaped clamp (345), the top and bottom ends of the side arc-shaped clamp (345) are both slidably equipped with side straight clamps (346), and the inner sides of the side arc-shaped clamp (345) and the side straight clamp (346) are both fixed with side insulating pads (347); The surface clamping member (35) comprises two vertical internal threaded members (351) threadedly sleeved on the vertical positive and negative threaded rods (33); a vertical extension member (352) is fixed to the front of each of the two vertical internal threaded members (351); a horizontal connecting rod (353) is slidably mounted inside the vertical extension member (352); a third spring (354) is fixed to the inner top wall of the vertical extension member (352) via a fifth shock-absorbing pad; one end of the third spring (354) is fixed to one end of the horizontal connecting rod (353) sliding inside the vertical extension member (352) via a sixth shock-absorbing pad; The other end of the horizontal connecting rod (353) is fixed with a vertical telescopic rod (358) via a first bolt, one end of the vertical telescopic rod (358) is fixed with a surface arc clamp (355), the top and bottom ends of the surface arc clamp (355) are both slidably equipped with surface straight clamps (356), and the inner sides of the surface arc clamp (355) and the surface straight clamp (356) are both fixed with surface insulating pads (357); The backs of the transverse internal thread member (341) and the vertical internal thread member (351) are both fixed with guide slide blocks, the top and one side of the outer wall of the adjustment plate (31) are both provided with guide slide grooves, and the transverse internal thread member (341) and the vertical internal thread member (351) are respectively slidably connected in the two guide slide grooves via the guide slide blocks; A guide rod (40) is fixed to the middle of the outer wall of the side arc clamp (345) and the surface arc clamp (355), and two guide members (50) are slidably sleeved on the guide rod (40), and one end of the guide member (50) is fixed to the adjustment plate (31); The transformer body (10) further comprises two lower shell covers (16) and two upper shell covers (17), wherein the two lower shell covers (16) and the two upper shell covers (17) are detachably fixed to the front and back sides of the lower shell (11) and the upper shell (12), respectively; An annular sliding groove is formed on the outer walls of the lower shell cover (16) and the upper shell cover (17), a rotating ring matching the annular sliding groove is fixed on the back of the adjustment disk (31), and the adjustment disk (31) is rotatably connected to the annular sliding groove via the rotating ring.

2. The low voltage current transformer according to claim 1, characterized in that: The outer surface of the transverse positive and negative threaded rod (32) is sleeved with two first bearing seats, one end of the first bearing seat is fixed to the adjustment disk (31), and the vertical positive and negative threaded rod (33) is sleeved with two second bearing seats, one end of the second bearing seat is fixed to the adjustment disk (31); A brake component (37) is sleeved on one side of the outer surface of the transverse positive and negative threaded rod (32) close to one of the first bearing seats, one end of the brake component (37) is fixed to the adjustment disk (31), and a knob stud (38) is threadedly passed through the brake component (37), and one end of the knob stud (38) that penetrates into the brake component (37) abuts against the outer wall of the transverse positive and negative threaded rod (32), so that the transverse positive and negative threaded rod (32) can be fixed in the brake component (37) after being rotated.

3. The low voltage current transformer according to claim 1, characterized in that: Positioning screw holes are provided at the edges of the outer walls of the lower shell cover (16) and the upper shell cover (17), and positioning bolts (39) matching the positioning screw holes are threadedly penetrated at the top and bottom of the outer wall of the adjustment disk (31), so that the adjustment disk (31) can be fixed to the surfaces of the lower shell cover (16) and the upper shell cover (17) after rotation.

4. The low voltage current transformer according to claim 1, characterized in that: The open iron core (13) comprises a lower iron core (131), the front and back sides of the lower shell (11) are provided with lower installation grooves adapted to the lower iron core (131), the lower iron core (131) is mounted in the lower installation grooves, the front and back sides of the upper shell (12) are provided with upper installation grooves, the upper iron core (132) is mounted in the upper installation grooves; The two ends of the lower iron core (131) and the upper iron core (132) are connected after the lower shell (11) and the upper shell (12) are fixed, and the enameled wire (15) is wound around the surface of the protective shell (14) on the upper iron core (132).

5. The low voltage current transformer according to claim 1, characterized in that: The upper surface of the upper shell (12) is provided with a strip-shaped sliding groove; The wiring unit (20) comprises a wiring member (21) slidably assembled in a strip-shaped slide groove, two lower contact pieces (22) are provided on both sides of the inner bottom wall of the strip-shaped slide groove, and four lower contact pieces (22) are evenly divided into two groups, and the ends of the enameled wires (15) on the two groups of open iron cores (13) are respectively connected to the two groups of lower contact pieces (22), and a wiring groove is provided on one side of the wiring member (21), and a fixed piece groove is provided on the inner bottom wall of the wiring groove, and an upper contact piece (23) adapted to the lower contact piece (22) is fixed in the fixed piece groove.

6. The low voltage current transformer according to claim 5, characterized in that: A valve piece is clamped at the edge of the wiring slot, and adjusting bolts are threadedly inserted through both sides of the upper surface of the wiring piece (21), and one end of the adjusting bolt inserted into the wiring slot is rotatably connected to a clamping piece; An extension piece is fixed to the bottom of the back side of the connection piece (21), a fixing stud is threaded through the extension piece, and two fixing screw holes matching the fixing stud are provided on both sides of the upper surface of the upper shell (12), so that the connection piece (21) can be fixed to the surface of the upper shell (12) after being moved.

7. The low voltage current transformer according to claim 5, characterized in that: Two guard plates (24) for protecting unused lower contact plates (22) are slidably mounted in the strip-shaped slide groove, and long grooves are provided on both sides of the middle of the bottom wall of the strip-shaped slide groove, and a first spring is fixed to one side wall of the long groove via a first shock-absorbing pad, and a slide plate adapted to the long groove is fixed to the lower surface of the guard plate (24), and one end of the first spring is fixed to the slide plate via a second shock-absorbing pad.

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